13 Entering the offset values for sensor measurements
The Offsets dialog box allows you to correct or balance some known deviations when measuring depth and/or height. Alternatively, you can enter the offset value from the relevant configuration dialog box.
Prerequisites
You can define the offset values of the measurements previously set up in the relevant sensor configuration dialog boxes.
Context
You can manually enter the offset value for the relevant sensor relative to the starting point.
When measuring height, offset is normally used to compensate the value read by the sensors placed on the trawl door. If you want to know the height from the door to the seafloor, you must enter the offset value to compensate the distance between where the sensor is placed on the door and the bottom of the door itself. The distance between the door adapter and the bottom of the door is the relevant offset.
When measuring depth by the depth lid of a sensor, there will always be a deviation in readings of a approximately +/- 1 or 2 m.
Procedure
1 Open the Setup menu.
2 Select Offsets to open the Offsets dialog box.
3 Enter the offset value for every measurement in the space provided for it.
4 Select OK to save the selected settings and close the dialog box.